rapidity.
speed, swiftness; the condition of being rapid
Meaning & usage
speed, swiftness; the condition of being rapid
A measure of velocity relative to the speed of light; defined as artanh(v), where artanh is the hyperbolic arctangent, and v = speed (with c = speed of light = 1).
A measure of the velocity of a particle in a beam relative to the beam's axis
Where this word comes from
From rapid + -ity, from French rapidité, from Latin rapiditas.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.